BIG N2O problem Please help me

VanDarela

VanDarela

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For those of you who don't know and maybe able to help me and for those of you who do know... I have an 05 LS V8 w/ a Zex nitrous system 50-100 wet shot, WBC (The WBC is only being used to shut off the N2O passed 12.1, I will not be using a window switch to engage at a certain RPM, i will be doing it by feel of the peddle), XCal, and minor mods, Everything is hooked up and spraying...But for some reason it engages the N20 at 1/4 throttle (which is like 2000RPM) instead of WOT.. I set the management box on the ZEX over again like 3 times to engage at WOT and it sets up like it should, i did it exactly the way it says to, but still it does it at 1/4 throttle. I called ZEX and they were the ones to tell me to set the management box again. I called WBC and they set me up to turn off at 12.1... I've run out of people to call so I need any help i can get, please.... This message is going to all the forums including the guy who installed the system. Is ther anything else i would need to buy to be able to get WOT?....anything will help at this point...thanks guys!!
 
That might be a question best suited for a n20 thread. I know there are some guys on here running n2o...but not many.
 
what year is your car. as i've mentioned in the past, if its 03+ the TBW system enages FULL throttle very frequently with very little gas pedal pressure. does this to avoid downshifting. for example, cruising on highway in d5 apply 20-25% gas pedal and it goes WOT but stays in fifth gear. In sst mode it appears to "listen" to the gas pedal.
 
sorry just noticed you have 05. I'd bet a shiney dime thats ur problem. see if you have the problem in sst mode. bet you dont.
 
the ZEX system is design to read your TPS voltage. When you reset it - it learns what the WOT voltage is and then uses that voltage to trigger the N2O. IIRC - you are using the kit for the new Mustang which also uses a TBW setup.

If you take a voltmeter and measure your TPS voltage at the tap on the TPS - you should see the voltage go from near 0V to almost 5V at WOT. If that checks out - it could be a crappy connection at the tap - or ground.
 
Quik LS said:
the ZEX system is design to read your TPS voltage. When you reset it - it learns what the WOT voltage is and then uses that voltage to trigger the N2O. IIRC - you are using the kit for the new Mustang which also uses a TBW setup.

If you take a voltmeter and measure your TPS voltage at the tap on the TPS - you should see the voltage go from near 0V to almost 5V at WOT. If that checks out - it could be a crappy connection at the tap - or ground.
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Yeah the guy at Zex told me to try to connect the ground directly to the battery and see if it works.
 
Quik LS said:
the ZEX system is design to read your TPS voltage. When you reset it - it learns what the WOT voltage is and then uses that voltage to trigger the N2O. IIRC - you are using the kit for the new Mustang which also uses a TBW setup.

If you take a voltmeter and measure your TPS voltage at the tap on the TPS - you should see the voltage go from near 0V to almost 5V at WOT. If that checks out - it could be a crappy connection at the tap - or ground.
Click to expand...

when you say tap you mean where he "tapped" into the wire..right?...Just gotta make sure
 
id be shocked if you get this working right. theres a big article in the service manual specifically talking about what they call "throttle angle control". The LS's TBW strategy goes WOT ALL THE TIME with relatively light throttle input. I think you will find you will either need to alway drive in SST mode when the system is armed or wire into one of the pedal position sensors instead of the TPS.

Dont believe me? Go out on the freeway in D5. Hit the gas just hard enough so that it doesn't downshift (20-25%). Make a mental note of the sound and your butt dyno readings. The put it in SST in 5th gear. Do the same thing then go to 50%, then 75%, then 100% (WOT). You'll find that WOT produces the same results as D5 did with 20-25% throttle input. Why? Because the LS was designed that way.
 
beaups said:
id be shocked if you get this working right. theres a big article in the service manual specifically talking about what they call "throttle angle control". The LS's TBW strategy goes WOT ALL THE TIME with relatively light throttle input.
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Which is ok - as long as the car is truely at WOT when the N2O kicks in - you're fine.

I would consider a window switch to keep the N2O only flowing over 2500rpm.....
 
VanDarela said:
when you say tap you mean where he "tapped" into the wire..right?...Just gotta make sure
Click to expand...


right - is all the connections are good - then it's likely working as designed - meaning the car is truely at WOT - reguardless of where you feel the pedal is.
 
the problem 'i think' is you will get a 5V (true WOT) reading even with light throttle pressure. I think it would be a great compromise to just tap into one of the pedal position sensors instead of the TPS. I've logged my TPS once in the past and as i suspected it goes 100% very frequently. maybe the Mustang has a different TBW strategy?
 
and btw if you DO tap into one of the pedal sensors keep in mind there are 3. IIRC 2 of them go from 0-5V and one goes from 5V-0. You'll need to know which one you are dealing with.
 
I don't believe you want to tap the throttle sensor.

You want to stay tapped to the TPS - and only spray when the car is truely at WOT - reguardless of the pedal. When the car is at WOT, you fuel is pumping, your A/F and timing strategy is coming off the tune tables in open loop. You should only ever spray the car a WOT.

So if the car is truely at WOT even if the pedal is only half down - it's fine.
 
good point quik. however wouldn't the pedal method produce the same results as a TPS method on a traditional car? also, just because the ecu moves the throttle doesn't guarantee anything else is working. I really think tapping the pedal sensors may be safer and more predictable.
 
beaups said:
good point quik. however wouldn't the pedal method produce the same results as a TPS method on a traditional car? also, just because the ecu moves the throttle doesn't guarantee anything else is working. I really think tapping the pedal sensors may be safer and more predictable.
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I believe you're exactly backwards on this - what you really care about is that the car (not the pedal) is at WOT. You do not want to spray unless the car is actually at WOT - reguardless of pedal. The worst senario would be that you push the pedal to the floor - the car PCM decided not to go to WOT (for some reason) and the N2O sprays....
 
I'm not sure - but I believe the car only goes into 'open loop' based on the PCM throttle control - not pedal position. Although pedal position obviously is a big input to the PCM requesting to go to WOT.
 
i think you are correct. one of the scenarios here it when traction control kicks in. I believe on TBW cars it just closes the throttle (instead of the traditional fuel cut method). That would be BAD when firing nitrous if you were wired to the pedal!
 
Quik LS said:
right - is all the connections are good - then it's likely working as designed - meaning the car is truely at WOT - reguardless of where you feel the pedal is.
Click to expand...

But how could it be at WOT when i feel the N2O kick in at 1/4 throttle? If im driving regular with the N2O engaged, as soon as i take off normaly it sprays at 1/4
 
Quik LS said:
I don't believe you want to tap the throttle sensor.

You want to stay tapped to the TPS - and only spray when the car is truely at WOT - reguardless of the pedal. When the car is at WOT, you fuel is pumping, your A/F and timing strategy is coming off the tune tables in open loop. You should only ever spray the car a WOT.

So if the car is truely at WOT even if the pedal is only half down - it's fine.
Click to expand...

so if the pedal is half down and the car regognizes WOT...keep it there or go all the way down?
 
This Sucks!!! the Zex system is basically just plug and play and now all this bs is going on!! not including the nitrous kit itself and little things like plugs and guages...im already in the hole $1200 only on instal and it still doesnt wor!!! the guy swears he did everything right!!!....sorry just had to vent
 
Van - it doesn't sound like anything is wrong. As long as the car is at WOT it is working correctly. if the car is not really at WOT when the N2O is spraying then you have a problem. The key it to figure that out.

If you have a laptop - you can use LiveLink through your XCal to log when the car is in open loop - there is a flag called 'open_loop' - that will tell you for sure.
 
Man are you gonna be mad if something goes wrong and you blow that engine. Being thats its an '05 arent you worried about ruining your factory warranty? Seems like a big sacrifice for a boost in power.
 
Quik LS said:
I don't believe you want to tap the throttle sensor.

You want to stay tapped to the TPS - and only spray when the car is truely at WOT - reguardless of the pedal. When the car is at WOT, you fuel is pumping, your A/F and timing strategy is coming off the tune tables in open loop. You should only ever spray the car a WOT.

So if the car is truely at WOT even if the pedal is only half down - it's fine.
Click to expand...

are you basically saying its fine where it is now?
 
Quik LS said:
Van - it doesn't sound like anything is wrong. As long as the car is at WOT it is working correctly. if the car is not really at WOT when the N2O is spraying then you have a problem. The key it to figure that out.

If you have a laptop - you can use LiveLink through your XCal to log when the car is in open loop - there is a flag called 'open_loop' - that will tell you for sure.
Click to expand...

I do have livelink and a lap top...how would i go about finding out this info...step by step (if you dont mind)...THANKS
 
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